A woman stretches in her run bra while she looks at the mountains in the background.


Bra Fitting Guide

Questions about bra measurements? We've got you covered. Check out our bra fitting tips, measuring guide, and solutions to common issues.

Fit fundamentals

Title : Fit fundamentals
Body :
CTA1 Title :
CTA2 Title :
A woman stretches in her run bra with arrows pointing to the flat, snug band.
A woman runs in her run bra with arrows pointing to the smooth, mouldable cups.
A woman tightens the straps on her run bra with arrows pointing to the adjustable straps.
run happy


How to measure your bra size

A woman measuring her bra band size.
  • You’ll need a flexible tape measure. It’s also best to wear a bra that doesn’t change your shape — no padding or compression. You can also just skip the bra.

  • Measure around your rib cage where the bottom band would sit. The tape measure should feel quite snug. If you get a fraction, round down to the nearest inch. Using , find your corresponding band size based on your measurement.

  • Measure around the fullest part of your boobs — which may not be the center — and round up to the nearest inch. Then subtract your rib cage measurement. The difference in inches is your suggested cup size. If you get a fraction, round up to the larger size.

Two women in run bras run across a pier with the ocean in the background.

How the Brooks Run Bra™ was made

Engineering the perfect run bra is a combination of science and art. Learn how meticulous research and runner insights influenced the perfect bra for your run.

Let’s find you a better bra

A pink background with illustrate run bra

Treat yourself to an instore fitting

A pink background with an illustrated map

See all our bras in one place

A pink background with multiple illustrated bras